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NON Chevy’s in the Wild

AJMBLAZER said:
Is the center section cylindrical?
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It appears to be that way - they have not pulled the axles yet but I was told that they were a weird worm gear drive set up.
This truck was bought for a salt mine since new - this is the first time that it has seen sunlight since it was new. They wheel bolt pattern is a huge six lug as well.
It’s got a Cummins 4BT in it so I don’t have a clue if when it was initially modified but apparently there are others just like it where it came from - I think it’s from South America.
They drove it around the yard and it was rev’d out in fourth gear in high and it was going at the speed of someone walking beside it - so this thing was never intended to get out on any roads.
 
rksjd8420 said:
That axle has planetary ends. The planetary ratio is usually at least 3.5:1 and then you multiply that by the differential ratio. Pretty much a Toyota version of an aircraft tug.
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The planetary hubs seemed to be standard fare for such an axle type but it’s the worm drive gear set up that has everyone talk’n about it - we’re wondering why the need for worm drive and not a normal hypoid or related type R/P and diff cause the back end doesn’t seem to be set up for any serious fifth wheel attachment, just a regular pintle hook.
It’s a cool set up though!
 
So it is a R/P set up and not a worm gear - seems rather small in diameter ( judging by the overall size of the chunk portion of the housing ) even with the benefit of the reduction in the hubs.
I guess that SPICER tab is an inspection cover to validate gear mesh upon set up - we thought it was the other end support area for the drive gear. Cool stuff.

Great diagram pics !
 
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tarussell said:
The planetary hubs seemed to be standard fare for such an axle type but it’s the worm drive gear set up that has everyone talk’n about it - we’re wondering why the need for worm drive and not a normal hypoid or related type R/P and diff cause the back end doesn’t seem to be set up for any serious fifth wheel attachment, just a regular pintle hook.
It’s a cool set up though!
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Probably whatever carts/trailers or equipment it towed wasn’t set up for a 5th wheel. Aircraft tugs all use pintles for the most part.

If I remember correctly planetaries take some of the strain off the diff gears. The HMMWV uses AMC 20 axle centers.
 
AJMBLAZER said:
Probably whatever carts/trailers or equipment it towed wasn’t set up for a 5th wheel. Aircraft tugs all use pintles for the most part.

If I remember correctly planetaries take some of the strain off the diff gears. The HMMWV uses AMC 20 axle centers.
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Yeah , the Model 20’s are only 8-7/8” gear and upside down even to allow for the two gear portal set up. I was shocked when I learned of that in the 90’s!

I think you’re right about the smaller R/P size benefiting from the ease of the hub reduction.

The 4WD probably takes away the need for weight over the axle for traction and ( as you said ) the pintle hook works just fine.

At this point all I know is that thing is geared real damn low and its cool factor is high.
 
They might have had weight in the rear bed or on the front sorta like tractor weights.

The Jeep and Chevy based aircraft tugs were like this.
 
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